Message 306478 - Python tracker

Message306478

Author	skrah
Recipients	davin, jeff.allen, mark.dickinson, rhettinger, serhiy.storchaka, skrah, tim.peters
Date	2017-11-18.10:13:29
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1511000010.07.0.213398074469.issue31630@psf.upfronthosting.co.za>
In-reply-to

Content
Tim has mentioned the high quality of fdlibm, and indeed I cannot reproduce the issue: wget -r http://www.netlib.org/fdlibm/ Then build libm with or without optimizations, with or without -m32, gcc or clang. Then compile a C program that calls tan(1.5707963267948961). This is a bit treacherous, because gcc apparently has a builtin tan(), so one needs to make sure that it actually uses fdlibm. gcc-4.7 -fno-builtin -O3 -m32 -Wall -W -o xxx xxx.c libm.a All is fine here (Ubuntu Linux).

Content

Tim has mentioned the high quality of fdlibm, and indeed I cannot
reproduce the issue:

    wget -r http://www.netlib.org/fdlibm/

Then build libm with or without optimizations, with or without -m32,
gcc or clang.


Then compile a C program that calls tan(1.5707963267948961).


This is a bit treacherous, because gcc apparently has a builtin
tan(), so one needs to make sure that it actually uses fdlibm.

gcc-4.7 -fno-builtin -O3 -m32 -Wall -W -o xxx xxx.c libm.a


All is fine here (Ubuntu Linux).

History
Date	User	Action	Args
2017-11-18 10:13:30	skrah	set	recipients: + skrah, tim.peters, rhettinger, mark.dickinson, serhiy.storchaka, jeff.allen, davin
2017-11-18 10:13:30	skrah	set	messageid: <1511000010.07.0.213398074469.issue31630@psf.upfronthosting.co.za>
2017-11-18 10:13:30	skrah	link	issue31630 messages
2017-11-18 10:13:29	skrah	create